Display device, electronic device including the same, and method of driving the same

Abstract

A display device including a display panel including a first display area containing first pixels at a first density and a second display area containing second pixels at a second density smaller than the first density, each of the first pixels and the second pixels including a light-emitting element, a power supply circuit configured to supply a first anode initialization voltage to each of the first pixels and supply a second anode initialization voltage to each of the second pixels, and a timing controller configured to control the power supply circuit so that a voltage level of the second anode initialization voltage becomes greater than a voltage level of the first anode initialization voltage.

What is claimed is: 
     
         1 . A display device comprising:
 a display panel comprising a first display area in which first pixels are disposed at a first density and a second display area in which second pixels are disposed at a second density smaller than the first density, wherein each of the first pixels and the second pixels comprises a light-emitting element;   a power supply circuit configured to supply a first anode initialization voltage to the light-emitting element included in each of the first pixels and supply a second anode initialization voltage to the light-emitting element included in each of the second pixels; and   a timing controller configured to control the power supply circuit so that a voltage level of the second anode initialization voltage becomes greater than a voltage level of the first anode initialization voltage.   
     
     
         2 . The display device according to  claim 1 , wherein a light transmittance of the second display area is higher than a light transmittance of the first display area. 
     
     
         3 . The display device according to  claim 1 , wherein the display panel further comprises:
 a display area comprising the first display area and the second display area; and   a non-display area located around the display area and comprising a pad area,   wherein, the pad area contains,   a first pad to which the first anode initialization voltage is applied, and   a second pad to which the second anode initialization voltage is applied.   
     
     
         4 . The display device according to  claim 3 , wherein the power supply circuit comprises a voltage conversion circuit electrically connected to the second pad and electrically isolated from the first pad. 
     
     
         5 . The display device according to  claim 1 , wherein the power supply circuit is configured to:
 supply the first anode initialization voltage at a first level; and   supply the second anode initialization voltage by sequentially increasing from the first level to a second level and then a third level.   
     
     
         6 . The display device according to  claim 1 , wherein the first pixel comprises a first sub-pixel comprising a light-emitting element of the first pixel, and the second pixel comprises a second sub-pixel comprising a light-emitting element of the second pixel,
 each of the first sub-pixel and the second sub-pixel comprises a first anode initialization transistor,   the first anode initialization transistor of the first sub-pixel is configured to switch an electrical connection between the light-emitting element of the first sub-pixel and a 4a th  power line to which the first anode initialization voltage is applied, and   the first anode initialization transistor of the second sub-pixel is configured to switch an electrical connection between the light-emitting element of the second sub-pixel and a 4b th  power line to which the second anode initialization voltage is applied.   
     
     
         7 . The display device according to  claim 6 , wherein the second sub-pixel further comprises a second anode initialization transistor, and
 the second anode initialization transistor of the second sub-pixel is configured to switch an electrical connection between the light-emitting element of the second sub-pixel and the 4a th  power line to which the first anode initialization voltage is applied.   
     
     
         8 . The display device according to  claim 7 , wherein the first anode initialization transistor and the second anode initialization transistor of the second sub-pixel are each connected to different sub-scan lines. 
     
     
         9 . An electronic device comprising:
 a sensor configured to emit infrared light;   a display device comprising a first display area in which first pixels are disposed at a first density and a second display area in which second pixels are disposed at a second density smaller than the first density, the display device being configured to supply a first anode initialization voltage to the first pixels and supply a second anode initialization voltage to the second pixels; and   a host configured to output a control signal to the display device so that a voltage level of the second anode initialization voltage becomes higher than a voltage level of the first anode initialization voltage while the sensor emits the infrared light.   
     
     
         10 . The electronic device according to  claim 9 , wherein the sensor is located to overlap with the second display area in a direction in which the infrared light is emitted. 
     
     
         11 . The electronic device according to  claim 9 , wherein the first display area surrounds the second display area. 
     
     
         12 . The electronic device according to  claim 9 , wherein the display device comprises a power supply circuit configured to supply the first anode initialization voltage and the second anode initialization voltage, and
 the host is configured to:   output an infrared sensor control signal for controlling a timing at which the sensor outputs the infrared light; and   output a power supply circuit control signal for changing the voltage level of the second anode initialization voltage output by the power supply circuit in accordance with a timing at which a level of the infrared sensor control signal changes.   
     
     
         13 . The electronic device according to  claim 12 , wherein the infrared sensor control signal has either a low level corresponding to a period in which the sensor is not operating or a high level corresponding to a period in which the sensor is operating,
 the power supply circuit is configured to raise the voltage level of the second anode initialization voltage from a first level during a period in which the infrared sensor control signal of the high level is input to the sensor, and   the first level is the level of the first anode initialization voltage.   
     
     
         14 . The electronic device according to  claim 13 , wherein the power supply circuit is configured to, when the sensor emits the infrared light, supply the second anode initialization voltage at a second level higher than the first level for a threshold period. 
     
     
         15 . The electronic device according to  claim 14 , wherein a length of the threshold period is less than one minute. 
     
     
         16 . The electronic device according to  claim 14 , wherein the power supply circuit is configured to, when the sensor emits the infrared light and the threshold period has elapsed, supply the second anode initialization voltage at a third level higher than the second level. 
     
     
         17 . The electronic device according to  claim 14 , wherein the power supply circuit is configured to, when the sensor stops emitting the infrared light, supply the second anode initialization voltage at the first level. 
     
     
         18 . A method of driving an electronic device, the method comprising:
 supplying a first anode initialization voltage at a first level to first pixels disposed at a first density in a first display area, and supplying a second anode initialization voltage at the first level to second pixels disposed at a second density lower than the first density in a second display area;   emitting infrared light by operating a sensor which is located to overlap with the second display area; and   supplying the first anode initialization voltage at the first level to the first pixels and supplying the second anode initialization voltage at a second level higher than the first level to the second pixels.   
     
     
         19 . The method according to  claim 18 , wherein each of the first pixels and the second pixels comprises at least one light-emitting element,
 the light-emitting element included in each of the second pixels comprises an anode electrode supplied with the second anode initialization voltage, and   the light-emitting element included in each of the first pixels comprises an anode electrode supplied with the first anode initialization voltage.   
     
     
         20 . The method according to  claim 19 , wherein the anode electrode of the light-emitting element included in each of the second pixels is further supplied with the first anode initialization voltage.